Connected: An Internet Encyclopedia
RFC 1035 - 3.2.5. QCLASS values

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### 3.2.5. QCLASS values

QCLASS fields appear in the question section of a query. QCLASS values are a superset of CLASS values; every CLASS is a valid QCLASS. In addition to CLASS values, the following QCLASSes are defined:

* | 255 any class

Next: 3.3. Standard RRs

Connected: An Internet Encyclopedia
RFC 1035 - 3.2.5. QCLASS values